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  • Title: Ammonium transformed into nitrous oxide via nitric oxide by Pseudomonas putida Y-9 under aerobic conditions without hydroxylamine as intermediate.
    Author: Huang X, Xu Y, He T, Jia H, Feng M, Xiang S, Wang S, Ni J, Xie D, Li Z.
    Journal: Bioresour Technol; 2019 Apr; 277():87-93. PubMed ID: 30660065.
    Abstract:
    Previous studies have reported that hydroxylamine (NH2OH) is an inevitable intermediate of the ammonium (NH4+) oxidation pathway under aerobic conditions. In this study, Pseudomonas putida Y-9 was found to oxidize ammonium into N2O via NO without the accumulation of NH2OH and NO2- under aerobic conditions. NH2OH was nearly completely transformed into NO2- whether NH4+ was present in the medium, and NH4+ could accelerate the transformation of NH2OH to NO2- by promoting Y-9 growth. NH4+ was oxidized rapidly by Y-9 with or without the presence of NH2OH in the medium, and the decrease of total nitrogen reached 30.65 mg/L and 39.38 mg/L, respectively, which indicates that NH2OH inhibits the transformation efficiency of NH4+ to N2O. Gene amplification and enzyme assays demonstrated that ammonia monooxygenase doesn't exist in Y-9. All results show that NH4+ can be transformed into N2O via NO by Y-9 under aerobic conditions without NH2OH as intermediate.
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